Cold Gas Spray allows to extend the range of steel coating formulations in comparison with other thermal spraying techniques because the material doesn’t melt during process. The absence of processes of fast solidification implies the absence of tensile stresses in the coating and makes possible to obtain thick coatings becoming a new alternative to welding cladding processes for the restoration of surfaces with corrosion pitting, notched areas or welded zones with bad appearance and for the repair of porous casting, contractions or losses of tolerance, by applying located coatings. 17-4 PH steel is one of the most widely used precipitation hardening grades in the business, offering high strength with corrosion resistance similar to S30400 in most environments. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high hardness, toughness and strength. Commonly used in both aircraft and gas turbines, nuclear reactor, paper mill, oil field, and chemical process components. A study has carried out in Thermal Spray Center for the production and optimization of thick coatings of 17-4 PH steel (S17400) through Cold Gas Spray technology onto carbon steel substrates. The study concentrates in the determination of influence of spray parameters on coating properties.

This study analyzes the tribological behavior of nickel-graphite and aluminum-silicon-polyester thermal sprayed coatings and the effect of non-metallic compounds. Self-lubricating coating composites based on a metallic matrix with ceramic or polymeric filler phases show potential applications requiring high wear resistance and thermal stability at low cost. In some cases, the nickel-graphite layer may eliminate the need for external lubricants or lubricating systems. Paper includes a German-language abstract.

This paper presents a process for manufacturing parts using HVOF spraying techniques. The parts are made from a mixture of chromium carbide and nickel chromium alloy powders and are characterized based on microstructure, hardness, and corrosion and wear performance. Paper includes a German-language abstract.

A number of experiments were carried out to optimize the thermal spraying of stainless steel using online monitoring. The experiments were designed to determine the influence of spraying conditions on in-flight particle behavior and layer properties. By measuring the speed, temperature, and spatial distribution of the particle stream, the monitoring system made it possible to optimize spray parameters and thus produce stainless steel layers with tailor-made properties. Paper includes a German-language abstract.

In this study, polyamide 11 and polyamide-alumina layers are produced by flame spraying and assessed based on microstructure and corrosion and wear resistance. Among the more notable findings: During the spraying process, there is a loss of crystallinity and polymorphism in the polymer due to high heating and cooling rates. Although some particle degradation occurs in flight, it is does not significantly alter the properties of the polymer. Insufficient substrate temperature impedes the melting of the polymer matrix and embedding of the ceramic filler particles, which has a negative effect on the abrasive wear resistance of the resulting composite layer. Overall, the coatings exhibit good corrosion resistance. During electrochemical testing in a saline solution, there was no electrolyte penetration. Paper includes a German-language abstract.

Actually abradable coatings obtained by thermal spraying are currently used in aeronautical industry. They improve the turbines tightness increasing in that way, their yield. The most relevant property of this kind of coatings is its easy machinability. They have good friction properties due to the lubricant phases such as graphite or polyester and could be used for surface engineering. To optimizate abradable coating It is necessary to study the wear mechanics implied in tribological processes. In the Thermal Spray Center of the Universitat de Barcelona, AlSi-Polyester, AlSi-Graphite and Ni-Graphite coatings have been studied. Their tribological study includes Ball on Disk (BOD) test (according to ASTM G99-90) to determinate the coating friction coefficient. The wear mechanism is determined by the study of the wear track by means of scanning electron microscopy (SEM) and Scanning white light interferometry (SWLI). Main common wear parameters are reported and compared to the steel substrate.

The HVOF forming is a process that permits to obtain wear resistant self-standing forms. The self-supporting forms that are obtained through the reshaping process by means of thermal spraying have two free surfaces that do not necessarily have the same structure or the same properties. This paper investigates the mechanical properties of the obtained in relation to the structure. It compares the structure-property relationship of the internal and external surfaces. The results show the anisotropic behavior of the internal and external free surfaces and their difference to the cross section. The structure of the system is characterized in terms of its nature, phase distribution, composition, and porosity. For the mechanical properties, the paper examines the microhardness and the modulus of elasticity of the material. Paper includes a German-language abstract.